Need some help confirming transactions using sha256

[kryptox.exchange]

I'm wondering if anyone can help me as I can't seem to get this to work. There is an online dice game that is provably fair by calculating the 'dice roll' using using a sha256 hash calculated against my transaction ID generated by me. The secret used to make the calculation is revealed at the end ofeach day thus allowing you to prove they didn't cheat. So they provide thefollowing to allow you to verify the calculation of the dice roll:

Secret used = r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA
Secret hash sha256(r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA) = 48d78d573b9b8e11a13a72d9a78011f2e5d9754d89de47b209f32c51777f535d
Lucky hash sha256(r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA:108128 06653842663997bf5971637f86f26c71a4716276d7fa8f323a83588d91:1) = dfa8769be81a543002865c88a5b52fa07f3b67fc7cd9b519c3f6a6452bcd48e4

Lucky Number 0x48e4 = 18660


So, I'm doing the following:

C:\Python27>python
Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.

import hashlib, hmac
txid = 'r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA'
secret = '10812806653842663997bf5971637f86f26c71a4716276d7fa8f323a83588d91:1'
for nout in range(10): print nout, int(hmac.new(secret, "%s:%d" % (txid, nout), hashlib.sha256).hexdigest()[:4], 16)

....
0 39800
1 4705
2 24058
3 11188
4 36307
5 781
6 62165
7 44612
8 17042
9 46099
idx 1 should equal 18660 but it doesn't. What am I doing wrong?


Secondly, I'm wondering if someone could help take it one step further. I would like to import a .txt file with a unique transaction ID on each line. So txid = transactions.txt or something like this. I would like it to getthe "lucky number" based on a static sha256 which I would supply and the script would output the result to a text file. I'd like the output to be foridx 1 only.

ie.
"txid here", "lucky number for idx 1"

Thanks for any help in advance!

Edit/Delete Message

 

[kryptox.exchange]

Ok, I'm still stuck!

I do however now think that I'm not supposed to use hmac here.

 

[Peter Pearson]

I'm wondering if anyone can help me as I can't seem to get
this to work. There is an online dice game that is
provably fair by calculating the 'dice roll' using using a
sha256 hash calculated against my transaction ID generated
by me. The secret used to make the calculation is revealed
at the end of each day thus allowing you to prove they
didn't cheat. So they provide the following to allow you
to verify the calculation of the dice roll:

Secret used = r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA
Secret hash sha256(r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA) = 48d78d573b9b8e11a13a72d9a78011f2e5d9754d89de47b209f32c51777f535d
Lucky hash sha256(r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA:108128 06653842663997bf5971637f86f26c71a4716276d7fa8f323a83588d91:1) = dfa8769be81a543002865c88a5b52fa07f3b67fc7cd9b519c3f6a6452bcd48e4

Lucky Number 0x48e4 = 18660

So, I'm doing the following:

C:\Python27>python
Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information. [snip]

.. . . which is the number you wanted, right?

 

[kryptox.exchange]

I'm wondering if anyone can help me as I can't seem to get

this to work. There is an online dice game that is

provably fair by calculating the 'dice roll' using using a

sha256 hash calculated against my transaction ID generated

by me. The secret used to make the calculation is revealed

at the end of each day thus allowing you to prove they

didn't cheat. So they provide the following to allow you

to verify the calculation of the dice roll:

Secret used = r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA

Secret hash sha256(r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA) = 48d78d573b9b8e11a13a72d9a78011f2e5d9754d89de47b209f32c51777f535d

Lucky hash sha256(r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA:108128 06653842663997bf5971637f86f26c71a4716276d7fa8f323a83588d91:1) = dfa8769be81a543002865c88a5b52fa07f3b67fc7cd9b519c3f6a6452bcd48e4
Lucky Number 0x48e4 = 18660
So, I'm doing the following:

C:\Python27>python

Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)] on win32

Type "help", "copyright", "credits" or "license" for more information.

import hashlib, hmac
txid = 'r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA'
secret = '10812806653842663997bf5971637f86f26c71a4716276d7fa8f323a83588d91:1'

[snip]

txid = 'r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA'
secret = '10812806653842663997bf5971637f86f26c71a4716276d7fa8f323a83588d91:1'
hashlib.sha256(txid+":"+secret).hexdigest()

'dfa8769be81a543002865c88a5b52fa07f3b67fc7cd9b519c3f6a6452bcd48e4'

18660

. . . which is the number you wanted, right?

Yes, thank you Peter!